White toner
a technology of toner and white, applied in the field of toner, can solve the problems of uneven toner charge, no image density stability, and likely positive charge of pigments
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production example 1
of White Pigment
[0133]An ilmenite ore containing 50% by mass of a TiO2 equivalent was dried at 150° C. for 3 hours, and sulfuric acid was added to dissolve ilmenite to prepare an aqueous solution of TiOSO4.
[0134]After the resulting aqueous solution was concentrated, 8 parts by mass of a titania sol having rutile crystals was added as seeds, followed by hydrolysis at 150° C. A slurry of TiO(OH)2 containing impurities was prepared.
[0135]The slurry was repeatedly washed at a pH of 5 to 6 to sufficiently remove sulfuric acid, FeSO4, and impurities. A slurry of high-purity metatitanic acid [TiO(OH)2] was thereby prepared.
[0136]After the slurry was filtered, 0.5 parts by mass of lithium carbonate (Li2CO3) was added, followed by firing at 300° C. for 4 hours. Then, the product was repeatedly subjected to a disintegration treatment with a jet mill to yield White pigment 1, which was titanium oxide fine particles having rutile crystals and a number average diameter of 55 nm.
production example 2
of White Pigment
[0137]An alcohol aqueous solution of 15.0 parts by mass of water and 165.7 parts by mass of isopropyl alcohol was added to a mixed solution of 100.0 parts by mass of aluminum isopropoxide and 11.1 parts by mass of isopropyl alcohol to perform hydrolysis (molar ratio of water / aluminum alkoxide=1.7, water content in the alcohol aqueous solution: 8.3% by mass).
[0138]In the next step, 99.3 parts by mass of isopropyl alcohol was separated through distillation to be recovered, and then an alcohol aqueous solution of 24.9 parts by mass of water and 64.2 parts by mass of isopropyl alcohol was further added to perform hydrolysis (molar ratio of water / aluminum alkoxide=2.8). The water content in the slurry was 7.8% by mass after the hydrolysis step was completed.
[0139]Water and isopropyl alcohol in the resulting suspension containing aluminum hydroxide, water, and isopropyl alcohol were removed to yield White pigment 2, which was aluminum hydroxide fine particles having a numb...
production example 3
of White Pigment
[0140]200 ml of an ethanol / water mixed solution (ethanol content: 50%) was cooled to −20 to 10° C., and 160 g of Ca(OH)2 was added thereto. While the resulting slurry-like liquid was being strongly stirred, a mixed gas of carbon dioxide gas / nitrogen (content of carbon dioxide gas: 30%) was introduced from a lower portion of a container at a flow rate of 500 to 5000 ml / min to perform a reaction until the pH started to reduce. At this time, the reaction temperature and the introduction rate of the carbon dioxide gas were adjusted to prepare a slurry containing synthetic calcium carbonate having an average primary particle diameter of 130 nm. Furthermore, each dispersion solution was filtered while a low temperate state was kept, followed by sufficient washing with pure water and then drying to yield synthetic calcium carbonate.
[0141]Water adjusted to 70° C. was added to the resulting synthetic calcium carbonate such that the solid content was 10% by mass, and the resul...
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